William Tibbals, 31, of Saco, was arrested Friday on the charges of visual sexual aggression against a child under 12 years old and multiple counts of invasion of privacy, Sgt. John O'Malley of Scarborough police said in a release.

The case began in July 2012 when Walmart customers reported seeing a man with a camera on his shoe trying to take pictures up or underneath women's skirts or dresses.

Saco police and the state police computer crimes task force in Lewiston helped Scarborough police in the investigation, O'Malley said.

Tibbals was being held on $2,500 cash bail on Friday night, a member of Cumberland County jail intake said.